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Thread: Four XTLs to one speaker

  1. #1
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    Default Four XTLs to one speaker

    I've got four XTLs and an ACU in a 12U portable box but I'm out of space for speakers inside and out. I can fit one, maybe two of the traditional Motorola speakers inside the case. I'd like to use the speaker connections and route them all into one speaker with the volume control on the radio still controlling them. Obviously I can't just wire them all together but I remember a device back in the day that could do this but the company appears to be defunct.

    Anyone have any current day solutions?

    Thanks.
    Schrodinger's Radio: It is simultaneously too loud and too quiet, but you will never know which until someone transmits.


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    Are the XTL's Tied to the ACU ?

    If so just put them in Monitor mode and us the ACU speaker -

    =========

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    I have a very similar problem, the answer I've found is, there isnt anything on the market currently to solve this problem. I'm working on bringing something to market to solve it.

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    It cannot be done passively. You can couple the audio through audio transformers and a gated audio switch like a 741 opamps. You would have to design it though. The other option is a audio mixer but these may not be practical in a portable environment.

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    I like the ACU speaker solution best, but if you have to tie them all together, make a bridge out of a handful of 4 and 16 ohm wirewound resistors, and 1uF non-polar caps. The 16 ohm resistors present a load to the radios with 4 ohm attenuation towards each other, and the caps provide DC isolation.
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    Quote Originally Posted by phonebuff View Post
    Are the XTL's Tied to the ACU ?

    If so just put them in Monitor mode and us the ACU speaker -

    =========
    All four XTLs are tied into the ACU but if I have two different patches going on this isn't feasible.
    Schrodinger's Radio: It is simultaneously too loud and too quiet, but you will never know which until someone transmits.

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    You can Monitor on the HSP and Patch modules on various nets. I have tied a VCR in on the HSP Speaker port and the pelco camera to make an incident activity record in the past with the HSP the target to monitor the tactical channels.

    ===========
    Net one is the HSP and 3 & 4, While Net 2 is 5 & 6 and the HSP is monitoring 3 - 6.

    Note the Headset Icon, and the HSP 3-6 under the module

    ACU Monitor.jpg

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    By the way, monitor is a great tool when you want one module to hear communication on another module / net, but not be able to transmit on that net.

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    Quote Originally Posted by phonebuff View Post
    You can Monitor on the HSP and Patch modules on various nets. I have tied a VCR in on the HSP Speaker port and the pelco camera to make an incident activity record in the past with the HSP the target to monitor the tactical channels.

    ===========
    Net one is the HSP and 3 & 4, While Net 2 is 5 & 6 and the HSP is monitoring 3 - 6.

    Note the Headset Icon, and the HSP 3-6 under the module

    ACU Monitor.jpg
    Interesting, I'll have to play around with that and see if I can get that to work. If the handset is plugged in and the switch is set to handset, will monitor audio still come out of the speaker or am I stuck with it routing based on the selector?
    Schrodinger's Radio: It is simultaneously too loud and too quiet, but you will never know which until someone transmits.

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    Okay, On the HSP switch I think it's Speaker or Handset. But the Audio jack and the rear Audio In / Out, External Speaker out I don't believe are switched, but I just don't remember. Sorry.

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    The product I'm looking for is by Fleet Radio Products, Model 4AMP-02. Here's an archive before they went defunct: http://web.archive.org/web/200408132...80/4AMP-02.htm

    Supposedly Command Comm out of Texas bought them and continues their product but they're "currently out of stock with more coming".
    Schrodinger's Radio: It is simultaneously too loud and too quiet, but you will never know which until someone transmits.

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    That was kind of a niche product even though the problem had been around for a while. You want to look for 12V mobile public address amplifiers. You may have to settle for a two channel stereo input mixer amp which gives you four inputs. Of course, you'l have to make your own XLR cables.
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    You can use five 70 volt transformers to mix four radios onto one speaker. Another solution would be a single transformer with five 4 ohm audio winding's. Dont know if such animal exists, but it will provide the needed DC isolation for the floating amplifier.

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    Likewise, if you can find an 8 to 32 ohm isolation transformer, use 4 and run the secondaries in parallel to get down to 8 ohms. Otherwise, you can use one of the mini circuit blocks for a mixer, but you'll need an external amp to actually drive the speaker as the mixer would operate at line levels, and you'll have to pad down the speaker outputs of the radios to line level.

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    I saw something in a magazine a few years ago. I dont know if it is still available but what it was was a dual wound input transformer (each input was isolated from each other with a single output winding. It was for an audio application but I dont really remember the details as it was just something i was reading through. You may be able to research something similar?

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    Quote Originally Posted by tuckerm View Post
    The product I'm looking for is by Fleet Radio Products, Model 4AMP-02. Here's an archive before they went defunct: http://web.archive.org/web/200408132...80/4AMP-02.htm

    Supposedly Command Comm out of Texas bought them and continues their product but they're "currently out of stock with more coming".
    They're gone, and never coming back. CC bought the parts stock from Fleet Radio and assembled those into working units, and once the parts ran out they just dropped them. I have two, and they're going into the dirt with me.

    The circuit is super-simple, just isolation transformers feeding a resistor bridge network feeding a 30W mono amp. The cast aluminum housing is what made them nice.
    "The Girl Scouts found several hungry REACT members at the finish line..."

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    Afternoon Tuckerm

    What you would be looking for is a Telex 1505 line driver card

    http://pdfstream.manualsonline.com/e...7de5862466.pdf

    This card has the ability to control up to 4 independent inputs and produce a single output

    Runs on 12VDC and offers a level control for each input and output

    Used many of these to accomplish the same task as each input is a transformer balanced 600 ohm or 10k

    Known issue you would have to control is setting the amplitude correctly so to not over drive the input with 5 watts of audio which may damage the card

    CoD

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    Hmmm, is there a market for something like this?

    Sent from my SM-T350 using Tapatalk

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    Won't a 4 chan mixer from radio design lab

    http://www.rdlnet.com/subcategory_pr...ubcat=16&cat=4

    meet this need ?

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    Quote Originally Posted by Akash1 View Post
    Won't a 4 chan mixer from radio design lab

    http://www.rdlnet.com/subcategory_pr...ubcat=16&cat=4

    meet this need ?
    He would still need an amp after it. He wants to sum four radios into one speaker.
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    Quote Originally Posted by Akash1 View Post
    Won't a 4 chan mixer from radio design lab

    http://www.rdlnet.com/subcategory_pr...ubcat=16&cat=4

    meet this need ?
    That's exactly what my suggestion was! Great minds think alike. I also mentioned needing the external amp for this solution, but I coudn't remember the RDL name. I have used several of their blocks to design and maintain a custom Fire dept. dispatch console in years past.

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    Here is what our amp looks like. We have an order for the CBP that is about to be filled and we should have about 200 left on this orderC021CF85-863B-4809-8F21-781BD0215F22.jpeg

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    Quote Originally Posted by cmdcomm View Post
    Here is what our amp looks like. We have an order for the CBP that is about to be filled and we should have about 200 left on this orderC021CF85-863B-4809-8F21-781BD0215F22.jpeg
    Will you be offering any to the public after that order is complete?

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    201B.jpg

    MODEL 201 1PG WEB FLYER.pdf
    Here is our most recent flier (sorry it is in add format)

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    Yes, we will have them, and we have the parts to build another 250 on the way as well...

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